A few hours later this bird enters the nest box. It has spent some time on the outside of the box pecking around the hole before finally coming in. This bird has a distinctly different cap with a very wide gap on the back right of its cap and a far less pointed front.
We are pretty sure that this is a more dominant male that has evicted the previous hen so he can move his own mate in. It (he) doesn’t do any of the typical chest rubbing or nest cup wriggling behaviour.